Inset maps: Artic Expeditions from the United States 1850-1968 and Antartic Expeditions from the United States 1819-1914, and 1942-1968. Map produced in 1970.
Source: The National Atlas of the United States of America (1970)

Map with territorial claims of Antarctica 2000.
Source: CIA - Central Intelligence Agency

Map with territorial claims of Antarctica 2000.
Source: CIA - Central Intelligence Agency

Map with territorial claims of Antarctica 1997.
Source: CIA - Central Intelligence Agency

Map with territorial claims of Antarctica 1995.
Source: CIA - Central Intelligence Agency

Antarctica, is Earth's southernmost continent, underlying the South Pole. It is situated in the Antarctic region of the southern hemisphere, almost entirely south of the Antarctic Circle, and is surrounded by the Southern Ocean. At 14.0 million km² (5.4 million sq mi), it is the fifth-largest continent in area after Asia, Africa, North America, and South America. About 98% of Antarctica is covered by ice, which averages at least 1.6 kilometres (1.0 mi) in thickness.
Source: CIA - Central Intelligence Agency

Southern Ocean 2008
Source: CIA - Central Intelligence Agency

The Amundsen-Scott South Pole Station is the southernmost continually inhabited place on the planet. Its name honors Roald Amundsen who reached the South Pole in December 1911, and Robert F. Scott who reached the South Pole the following month.
Source: USGS

Source: CIA - Central Intelligence Agency

Research stations and territorial claims in Antarctica
Source: CIA - Central Intelligence Agency